Fastening means for planer-heads.



H. J. MITCHELL.

FASTEN MEANS FOR PLANER HEADS.

APP I TION FILED DBO.14,1908.

1,049,589. 7 PatentedJanflL lQB.

"*lates more particularly". to improved and .receive and accommodate thebases of the .pnri ap stlmtrss orrioni HARRISON J. MITCHELL/FBEnoInwIsooNsIN, .essIGNoR 'ro THE, BERLiN'MAc IivE,

:WOBKS, or VBELOIT, WISCONSIN, A CORPORATION OF wIsooNsIN. j g

' Beit known that I, HARRISON 1J. MIT ELL, a citizen of theUnitedjS-t-ates, residingat FASTENING MEANS FOR PLANER-I-IEADS.

i I Specification of Letters Patent.

. Application fiIed DecemibeI '14,19os.' Serial No. 4 7,417.

To alt w/wm it may concern; 1

Beloit, in the county ofltock and State of Wisconsin, have inventedcertainnew and useful Improvements in Fastening. Means i I forPlaner-Heads and the Like, of which the following is aspecification."

This invention pertains to nnprovement-s in the heads or cylinders ofplaners, and re- I novel [means for fixedly holdi'ngand securing beadingknives or the like in place. Each of such knives has. a base,-preferably of dovetail or similar conformation, adapted to fit inacorrespondingly-shaped or undercut groove or slot on the planercylinder surface, the bases of the beading knives beforce them into suchposition or relation. f

' ing heldinfirm engagement with the walls of such grooves bysuitablemeans which will In my preferred embodiment, of the inventionthe bases of thefknives are made so as to be capable of expansion, and Iemploy expanding means such as tapered screws to ..,enla-rge the basesand cause them to press 'firmly against the undercut s1des of thegroove.

In the accompanying drawing, which forms a part of this specification, Ihave illustrated a preferred embodiment ofv the invention, and in thesedrawings-Figure 1 made apparent that the planer head or cylis afragmentary perspective view of a planer cylinder equipped with theinvent-ion,-the cylinderalso having an lmproved inder 11, only aportion-of which is shown in any of the figures, has extended across itscylindrical face or periphery one or more dovetail or (undercut grooves12 adapted to A preferred embodiment of the invention is shown inFigs.1, 2 and 3, in which the heading knife 16 hasa base 17 shaped to fitwithin the groove 12 beneath the overhanging wallsl l and 15, which baseis of'sub- Patented Jan. 7,1913.

st-antially no'greater width thanthe knife I itselfgand. is verticallydivided or slotted at; 18, as shown, and also equipped with a' taperedscrew hole intersected by. this slot or out, this hole being intended toBCCOIHIIIQ? 1 date a tapered tightening screw 19Z As is obvious, theturning of this screw so as to force it =-inwardly will enlarge the'base,

V spreading its two portions apart so that they 7 will firmly andsecurely p-ress.againstw.the

walls of the groove, thereby holdinglthe knife in fixed operativeposition. ,The

taperedscrew hole is made somewhat inclined to, the plane of the 'bottomof the groove so as to facilitate the turning of the I screw by ascrew-driver of the ordinary characten and to avoid the necessity of aIn the embodilaterally "extending base. ment illustrated one portion ofthe base is pressed rearwardly into the back part of the groove, whilethe other portion is forced forwardly beneath the front wall of thegroove, so thatin each instance the knifeis securelyheld from moving outof its cor-- rect operative position. Such beading knives are frequentlyused on a planer cylinder also equipped withstraight-edge planingknives,

and in order that the latter may be prop); e

erly jointed'during the rotation of the cylin der or head, it isnecessary to take out the beading-knives, and of course they should bereplacedin exactly the same positions I which they'previously occupied.To facilitatethis replacement the undercut or dovetail grooves may besupplied with oneor' more stop or abutment blocks also shaped to 1conform substantiallyto the cross-section of the groove. One form ofsuch block is shown in Fig. 1 at 21. As'is clearly illus- .trated, thisblock is provided with arsulo- .stantially central threaded holeextended 1 therethrough which receives. a tightening screw 22-bearingagainst the bottom face of 1:

the groove and forcing theblock-upwa-rdly so that 'its inclined sidesarebrought into 1 ment. After one or more ofgthese stop or abutment blockshave beeniproperly posifirmengagement with the-inclined side walls ofthe undercut groove, the frictionbetween the parts being sufliclenttoprevent dislodg- .tioned and tightened in the groovesythe knivescoiiperating therewith maybe readily taken out and replaced withoutdifficulty in exactly the same positions which they previously occupied.

To those skilled in the art it will be readily understood that thebeading knives and stops are to be grouped in the holding grooves inconformity to the form and style of beading to be produced on the boardsor lumber, and in the drawing of this application I have not attemptedto show any such arrangement of knives, but have merely indicated inFig. 1 a plurality of such knives.

The various features of detail herein shown and described may be changedand modified within wide limits without departure from the substance andessence of my invention, and without the sacrifice of any of itsbenefits and advantages.

I claim 1. The combination of a planer cylinder having an undercutgroove on its outer surface, a knife having a dovetail base adapted tofit in said groove, said base having a threaded hole disposedtransversely of the cutting edge of said knife, and inclined to thebottom of said groove, said base having also a slot dividing the baseand intersecting said threaded hole in the plane of its axis, and

a tapered screw threaded into said hole to spread the slotted base ofthe knife and force the beveled edges thereof against the Walls of saidgroove to securely hold the knife in operative posit-ion, substantiallyas described.

2. The combination of a planer cylinder having a longitudinallyextending undercut groove on its periphery, a planer knife having adovetail base of substantially the same width as the body of the knifeand adapted to fit in said groove, said base having a taperingscrew-threaded hole extending therethrough longitudinally of theundercut groove and inclined to the bottom of said groove and havingalso a slot'intersecting said hole and dividing the base, and a taperedscrew threaded into said ho-leto force the sides of the base apart,whereby the beveled edges thereof are forced into engagement with theundercut walls of the groove to securely hold the knife in operativeposition, substantially as described.

HARRISON J. MITCHELL.

\Vitnesses U. G. PERKINS, L. M. RANDALL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

